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/* Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <termios.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include "pty-internal.h"
#include <stdio-common/_itoa.h>
#include <sys/sysmacros.h>
/* Given the file descriptor of a master pty, return the pathname
of the associated slave. */
static char namebuf[PTYNAMELEN];
extern const char __ptyname1[], __ptyname2[]; /* Defined in getpt.c. */
char *
ptsname (fd)
int fd;
{
return __ptsname_r (fd, namebuf, PTYNAMELEN) != 0 ? NULL : namebuf;
}
int
__ptsname_r (fd, buf, buflen)
int fd;
char *buf;
size_t buflen;
{
struct stat st;
int save = errno;
int ptyno;
char nbuf[PTYNAMELEN], idbuf[6];
char *cp;
#ifdef TIOCGPTN
static int tiocgptn_works = 1;
#endif
if (!buf)
{
__set_errno (EINVAL);
return EINVAL;
}
if (!__isatty (fd))
{
__set_errno (ENOTTY);
return ENOTTY;
}
#ifdef TIOCGPTN
if (tiocgptn_works)
{
if (ioctl (fd, TIOCGPTN, &ptyno) == 0)
goto gotit;
else
{
if(errno != EINVAL)
return errno;
else
tiocgptn_works = 0;
}
}
#endif
if (__fxstat (_STAT_VER, fd, &st) < 0)
return errno;
ptyno = minor (st.st_rdev);
if (major (st.st_rdev) == 4)
ptyno -= 128;
#ifdef TIOCGPTN
gotit:
#endif
/* Two different possible naming schemes for pty slaves:
the SVr4 way. */
idbuf[5] = '\0';
__stpcpy (__stpcpy (nbuf, "/dev/pts/"),
_itoa_word (ptyno, &idbuf[5], 10, 0));
if (__xstat (_STAT_VER, nbuf, &st) < 0)
{
if (errno != ENOENT)
return errno;
/* ...and the BSD way. */
nbuf[5] = 't';
nbuf[7] = 'y';
nbuf[8] = __ptyname1[ptyno / 16];
nbuf[9] = __ptyname2[ptyno % 16];
nbuf[10] = '\0';
if (__xstat (_STAT_VER, nbuf, &st) < 0)
return errno;
}
if (buflen < strlen (nbuf) + 1)
{
__set_errno (ERANGE);
return ERANGE;
}
cp = __stpncpy (buf, nbuf, buflen);
cp[0] = '\0';
__set_errno (save);
return 0;
}
weak_alias (__ptsname_r, ptsname_r)
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